In an underwater adventure, the lovable Nobita finds himself accompanied by his beloved robot companion Doraemon as they embark on a diving excursion. As they explore, they encounter Sophia, a captivating mermaid who instantly befriends them. Accompanying Sophia back to her kingdom, Nobita and Doraemon find themselves caught in the middle of a conflict between two rival tribes. Through this journey, they learn about underwater society dynamics and the importance of finding common ground amidst differences, all while forging lasting friendships in a world vastly different from their own.
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